O
- (Cher) Ourouer-les-Bourdelins
- (Loiret) Ousson-sur-Loire
- (Indre-et-Loire) Orbigny
- (Cher) Oizon
- (Indre) Orsennes
- (Loir-et-Cher) Ouchamps
- (Loir-et-Cher) Orchaise
- (Eure-et-Loir) Oulins
- (Eure-et-Loir) Orgères-en-Beauce
- (Loiret) Ouzouer-sur-Trézée
- (Loir-et-Cher) Oucques
- (Loiret) Outarville
- (Loir-et-Cher) Ouzouer-le-Marché
- (Cher) Orval
- (Loiret) Ouzouer-sur-Loire
- (Loiret) Ormes
- (Loir-et-Cher) Onzain
- (Loiret) Olivet
- (Loiret) Orleáns